The first option is the one mentioned before, the optimization level. This configuration option can be set by using the opt-level key in the relevant profile section. By default, optimizations will be level 3 for benchmarking and release, and zero for the rest. For example, to only perform level 2 optimizations in the release profile, you can add this code to your Cargo.toml file:

    [profile.release]
    opt-level = 2